Thanks to everyone who responded. Mike, your step by step instructions turned on the light bulb for me. The idea of clamping the window freed up a hand since am working alone. And then the regulator sequence you outlined turned on the second bulb.
The problem I was having was I could not get the white regulator coaster to go into the rear of the door track. So I assumed it must go in from the front of the track. But each time I tried, one or the other of the two other coasters would fall off of the window track. Finally I realized that the PO had pinched the rear end of door track narrowing the slot which prevented the coaster from going in. Once I opened it up the regulator coaster went into the door track without a problem. So one window down and one to go.
'79 TR7 DHC
'76 TR7 FHC